The Averaged Evoked Response Threshold for Monaural And Binaural Masked Signals

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Abstract
The parameters of the averaged electroencephalic response (AER) are well documented for simple listening situations; this experiment was designed to explore the AER to more complex conditions. The AER and behavioral thresholds were measured for five human subjects. A 500-Hz 20-msec tone (with a rise/fall time of 5 msec) and continuous white noise were delivered through headphones for the following conditions: NmSm, NoSo, NoSm, and NπSo. Behavioral and AER masked thresholds were approximately the same for the NoSo condition but averaged about 6 dB poorer for the AER for the NmSm condition than for the behavioral condition. Both the AER and behavioral thresholds for the NoSm and NπSo were of typical threshold differences (5 dB and 12 dB, or better, respectively) than the NmSm and NoSo conditions. The results indicate that: (1) the AER reflects the signal in the presence of noise background; (2) the AER reflects binaural interaction as demonstrated by the MLD; (3) the AER masked threshold is better with binaural presentation (NoSo) compared to monaural presentation (NmSm).

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